Marius is a Roman name derived from either the Roman Mars (God of War), or else from the Latin root mas, maris meaning "male". Often thought to be from the Roman "mar" (of the sea). In Christian times, it was syncretized as a masculine form of the unrelated feminine given name Maria, from the Hebrew Miriam, Aramaic variant Mariam, and used alongside it. It is a name that can refer to:

• Marius (crater), a lunar impact crater
• Marius (film), written by Marcel Pagnol.
• "Marius" (Anderson), a science fiction story by Poul Anderson.

Roman name:

• Gaius Marius (157 BC — 86 BC), Roman general
• Gaius Marius the Younger, son of Gaius Marius
• Gaius Marius Victorinus (4th century) Roman philosopher
• Marcus Aurelius Marius, (d.268), Gallic Emperor
• Marius Maximus (fl. early 3rd century), Roman senator and biographer of Emperors

Surname:

• Clinton Marius (b.1966), South African performer and writer
• Johann Simon Mayr (1763-1845), German composer
• Richard Marius (1933-1999), Reformation scholar
• Simon Marius (1573–1624), German astronomer (Simon Mayr)

Given name:

• Marius Edelsbrunner (b.1992), Analyst and developer of computer language
• Marius Borg Høiby (b.1997), first child of Mette-Marit, Crown Princess of Norway
• Marius Constant (1925-2004), French composer and conductor
• Marius Ebbers (b.1978), German footballer
• Marius Fekete (b.1959), Romanian politician
• Marius Lăcătuş (b.1964), Romanian footballer
• Marius von Mayenburg (b.1972), German actor and playwright
• Marius Müller-Westernhagen (b.1948), German musician and actor
• Marius Petipa (1819-1910), French-Russian ballet dancer / choreographer
• Marius Trésor, French footballer
• Marius Urzică, Romanian gymnast
• Marius Vinzon Ygonia
• Marius Austin Saavedra, Ateneo de Zamboanga University Player, junior basketball

Fiction:

• Marius the Epicurean, novel and its hero by Walter Pater
• Marius Pontmercy, a principal character in Les Misérables
• Marius de Romanus, a character in the Vampire Chronicles universe created by Anne Rice.
• Marius, the narrator of Diablo II cutscenes

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